The running in of the engine is very important, and the new engine must not be fully opened within 350 km/h. Each gear can only be driven at 80% of the speed in that gear, and should be changed at any time. If the engine is not properly broken in, it will break down. After 350 km of operation, the engine should be repaired to compensate for minor wear and tear during the break-in period to ensure good engine performance. Adjustment of Idle Speed(1) Twist the net idle adjustment screw clockwise to ensure safety, then reverse it by 15/8 turns.(2) Heat the engine to operating temperature, then connect the tachometer and adjust the idle speed to 1500 r/min using the oil and plunger adjustment screw.(3) Rotate the idle adjustment screw again to increase the stable engine speed to the maximum, and then adjust the plunger adjustment screw to the specified 1500r/min.The Use of Electric Starting:It is advisable to start with electric power in neutral position, or in any gear, but the clutch must be disengaged (control the clutch lever tightly). If the battery power is depleted, simply drive a few kilometers to charge it and it can be used.Application of Single Automatic ClutchTo stop or emergency stop the vehicle, it is necessary to slow down (use a switch to loosen the oil) and press the gear change pedal all the way down, without allowing it to return to its original position and then press the manual springboard, in order to stop the vehicle quickly, extend the service life of the clutch, and ensure personal safety.Engine Model: JT152FM (H)Cylinder Bore*Range: 52.4×49.5Displacement: 108m1 (107m1)Compression Ratio: 8.8: 1Primary Deceleration Ratio: (Auto) 4.058Wheel Gear Ratio I: 3. 273Wheel Gear Ratio II: 1. 938Wheel Gear Ratio : 1. 350Wheel Gear Contrast Ratio IV: 1.043Fire Point System: Variable-horizontal CDIFire Plug Model : 1136 or 1137Fire Plug Gap : 0.6m-0.7mLubricant Grade: 15W/40-DE 4-stroke Gasoline Engine OilFuel Grade: 90 Gasoline RQ-90Lubricating Oil Capacity: 800mlMinimum Fuel Consumption Rate: ≤365g/kw.hStarting Performance: 15SIntake: On at 20°C Prior to the Starting Point, Off at 48°C after the Starting Point.Exhaust: On at 48°C Up, off at 20°C Down.Clearance: 0.05mm (Cold)Clutch Type: Wet Multi-Channel Normally Open Wet Multi-Channel Normally ClosedStarting Method: Electric and Kick StartTransmission Type: 4-speed Cyclic or 4-speed Non-cyclicIdle Speed: 1500r/minFrequently Occurring Faults and Troubleshooting1. Trouble Phenomenon: Hard to Start Cause Analysis: Improper Gap in Fire Plugs Fire Plug Burns Damage to Parts of the Fire Ignition System Fuel Circuit Blockage Improper Concentration of Mixed Substances Fire Extinguisher BlockageExclusion Formula: Adjust the Room Temperature Replace the Flower Plug Replacing the Pointer (CD) Dredging Oil Pipelines Adjusting the Concentration of Mixed Substances Eliminating Carbon Deposits2. Fault Phenomenon: Engine Overheating Cause Analysis: Improper Concentration of Mixed Substances Fire Extinguisher Blockage Exclusion Formula: Adjust the Concentration of Mixed Substances Clearing the Fire Extinguisher3. Fault Phenomenon: The engine is prone to stalling during acceleration or idling Cause Analysis: Poor Flower Plug Poor Filtration Performance of Carburetors during Acceleration Unstable Idle Speed of Carburetor Exclusion Formula: Replacement Adjust the Mixer, Eliminate and Adjust the Idle Oil Needle4. Fault Phenomenon: There is a knocking sound from the engineCause Analysis: Wear of Pistons, Piston Rings, and Hydraulic Cylinders Broken or Stuck Piston Rings Excessive Accumulation of Dust in the CylinderExclusion Formula: Replacement Replace or Eliminate Carbon Deposits Eliminating Carbon Deposits 【High Quality】 110CC 4-stroke single-cylinder engine air-cooled motor, using high-quality aluminum cylinder head and an iron block, stable performance and high reliability. 【Stepless Variable Speed】The 110cc engine motor is stepless variable speed, automatic gear, no forward gear/neutral gear/reverse gear. 【Package Includes】This engine assembly comes with intake pipe and spark plug. It doesn't come with Carburetor, Battery, CDI, Voltage Regulator and Ignition Coil. 【Fitment】This 110cc engine automatic fits most China made 50cc, 70cc ,90cc ,110cc ATVs and Go Karts since the mounting holes are same. Replacement OEM Number: 308-999003 【Note】This 110cc engine motor is chain driven. It is forward only. Please do not buy if your engine with starter bottom mounted since the mounting holes are not same. ASIN B0CWL5V4TY Model 110CC Engine Speed 8000 RPM Brand Name Aupitolt Horsepower 6.71 Horsepower Model Name 110CC Engine Part Number 110CC Engine Motor Manufacturer Aupitolt Item Type Name 110CC Engine Motor Included Components This engine assembly comes with intake pipe and spark plug Warranty Description 6 Month